headache

i am very interested in where headaches come from. i mean, what causes them? i rarely get them but allison seems to get them frequently. i am one of those people who rarely gets sick and i sometimes think people are faking when they say they are "sick".

why am i talking about this? well, because today i have a major headache. all those who i thought were faking in the past, please forgive me. headache meds here i come.